Preparation of ZrO2-Al2O3 composite carrier by precipitation method and preliminary study on its catalytic performance in methanation
WU Gang-qiang1,2, LANG Zhong-min1, WANG Ya-xiong1, XU Shao-ping2
1. School of Chemistry and Chemical Engineering, Inner Mongolia University of Science & Technology, Baotou 014010, China; 2. School of Chemical Engineering, Dalian University of Technology, Dalian 116024, China
Abstract: A porous ZrO2-Al2O3 composite carrier is synthesized by a precipitation method using a mixed solution of zirconium oxychloride and aluminum nitrate as a precursor,ammonia as a precipitant and PEG-6000 as a dispersant.The effects of the concentration of mixed solution,the molar ratio of zirconium to aluminum,the dosage of dispersant and the roasting time on the specific surface area of porous ZrO2-Al2O3 composite carrier are investigated by orthogonal experiment.The optimal process conditions for the synthesis of porous ZrO2-Al2O3 composite carrier are obtained by orthogonal analysis as follows:the concentration of mixed solution is 0.4 mol·L-1,the molar ratio of zirconium to aluminum is 3∶7,the dosage of dispersant (polyethylene glycol-6000) is 1 g,and the roasting time is 6 hours.ZrO2-Al2O3 composite carrier synthesized under the optimum conditions is characterized by BET,SEM,XRD and particle size analysis.The results show that the synthesized ZrO2-Al2O3 composite carrier has small particle size,uniform particle size distribution,loose surface and large specific surface area,and is suitable as a carrier for supporting catalysts.Ni/ZrO2-Al2O3 catalyst is prepared through impregnation method by loading Ni and its catalytic activity for methanation is preliminarily detected.It is found that the conversion rate of CO over the catalyst increases monotonically with increasing temperature,reaching 89% at 470℃,and decreases then.CH4 selectivity also has a similar variation pattern,reaching 98% at 470℃.
吴刚强, 郎中敏, 王亚雄, 徐绍平. 沉淀法ZrO2-Al2O3复合载体的制备及其甲烷化催化性能初探[J]. 现代化工, 2020, 40(2): 110-113.
WU Gang-qiang, LANG Zhong-min, WANG Ya-xiong, XU Shao-ping. Preparation of ZrO2-Al2O3 composite carrier by precipitation method and preliminary study on its catalytic performance in methanation. Modern Chemical Industry, 2020, 40(2): 110-113.
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